Service account and root account passwords for ESXi show disconnected in SDDC manager after changing the password expiration time in ESXi.
SDDC manager 4.x
SDDC manager 5.x
Changing the password expiration for the svc and root accounts in ESXi to a shorter date then when the password was last changed will cause the passwords to immediately expire and SDDC manager to show the passwords are disconnected
Change the SVC account password in ESXi to a new password to clear the expiration and then remediate the password in SDDC manager.
If you want to keep the same service account password you can pull the service account passwords with the following KB:
https://broadcomcms-software.wolkenservicedesk.com/external/article?articleNumber=327195